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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '199410e6c0ecd5bfb3b8eb4be4c4e21c321fe25c6d6e0e1ce728ca0dad8f9909' 
  AND token = 'bjjLxhBu2cQ5DQQQ0jexVDRwBIDz54Fr09qCMHfot6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}